On 10/14/16 1:01 AM, Mark Thomas wrote:
On 12/10/2016 16:22, Rallavagu wrote:
Tomcat 7.0.70 - Sun JDK 1.7.0_80
I have following long running thread (almost 5 sec).
No you don't. That thread isn't doing it any work. It is blocking,
waiting for I/O.
Well, I got in impression because the thread shows as "RUNNABLE" in tow
thread dumps in a row.
It appears to be reading data from socket
Sort of correct. It is waiting for data to arrive.
I suppose it is waiting for the data to arrive from slow clients?
(external resource potentially).
Wrong.
Wonder how I
could go about debug these kind of threads to understand which external
resource is it spending more time on reading. Thank.
The stack trace contains class names and line numbers. The source code
is freely available. While the class names themselves provide a broad
hint as to what this thread is waiting for, you always have the option
of looking at the source code.
In this case start with these:
AbstractHttp11Processor line 994
Http11Processor line 168
Here is what at line 168 of Http1Processor
if (!inputBuffer.fill()) {
throw new EOFException(sm.getString("iib.eof.error"));
}
I couldnt make much out of this. But, I assume that this thread is
waiting for client to finish sending the data?
Thanks for the response.
Mark
"http-bio-28080-exec-523" daemon prio=10 tid=0x00007fc5e403e000
nid=0x3cbd runnable [0x00007fc51ce0d000]
java.lang.Thread.State: RUNNABLE
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:152)
at java.net.SocketInputStream.read(SocketInputStream.java:122)
at
org.apache.coyote.http11.InternalInputBuffer.fill(InternalInputBuffer.java:516)
at
org.apache.coyote.http11.InternalInputBuffer.fill(InternalInputBuffer.java:501)
at
org.apache.coyote.http11.Http11Processor.setRequestLineReadTimeout(Http11Processor.java:168)
at
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:994)
at
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:623)
at
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)
- locked <0x00000006e20ac9e8> (a
org.apache.tomcat.util.net.SocketWrapper)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
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